Title: Influence of 3D plasmoid dynamics on the transition from collisional to kinetic reconnection

Abstract

Within the resistive magnetohydrodynamic model, high-Lundquist number reconnection layers are unstable to the plasmoid instability, leading to a turbulent evolution where the reconnection rate can be independent of the underlying resistivity. However, the physical relevance of these results remains questionable for many applications. First, the reconnection electric field is often well above the runaway limit, implying that collisional resistivity is invalid. Furthermore, both theory and simulations suggest that plasmoid formation may rapidly induce a transition to kinetic scales, due to the formation of thin current sheets. Here, this problem is studied for the first time using a first-principles kinetic simulation with a Fokker-Planck collision operator in 3D. The low-β reconnecting current layer thins rapidly due to Joule heating before the onset of the oblique plasmoid instability. Linear growth rates for standard (k _y = 0) tearing modes agree with semicollisional boundary layer theory, but the angular spectrum of oblique (|k _y|>0) modes is significantly narrower than predicted. In the nonlinear regime, flux-ropes formed by the instability undergo complex interactions as they are advected and rotated by the reconnection outflow jets, leading to a turbulent state with stochastic magnetic field. In a manner similar to previous 2D results, super-Dreicer fields inducemore » a transition to kinetic reconnection in thin current layers that form between flux-ropes. These results may be testable within new laboratory experiments.« less

Authors:

Stanier, Adam John  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-6050-6159"
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Daughton, William Scott  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-1051-7559"
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Le, Ari Yitzchak  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-9381-6839"
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Li, Xiaocan  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-5278-8029"
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Bird, Robert Francis  ^[1]

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• Search DOE PAGES for ORCID "0000-0003-1228-498X"
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+ Show Author Affiliations

1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:

2019-07-31

Research Org.:

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

USDOE Office of Science (SC). Fusion Energy Sciences (FES) (SC-24); USDOE

OSTI Identifier:

1558975

Alternate Identifier(s):

OSTI ID: 1545908

Report Number(s):

LA-UR-19-23318
Journal ID: ISSN 1070-664X

Grant/Contract Number:  

89233218CNA000001

Resource Type:

Accepted Manuscript

Journal Name:

Physics of Plasmas

Additional Journal Information:

Journal Volume: 26; Journal Issue: 7; Journal ID: ISSN 1070-664X

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Magnetic Fusion Energy